[55b] And the third solid1 is composed of twice sixty of the elemental triangles conjoined, and of twelve solid angles, each contained by five plane equilateral triangles, and it has, by its production, twenty equilateral triangular bases.Now the first of the elemental triangles ceased acting when it had generated these three solids, the substance of the fourth Kind2 being generated by the isosceles triangle. Four of these combined, with their right angles drawn together to the center, produced one equilateral quadrangle; and six such quadrangles,
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